I’ve used a CGM to tune my sports fueling, they are a very effective solution, but of little use unless the data they provide is understood and addressed by dietary changes. In terms of sports fueling they provide a very good overview across events or workouts but they don’t provide an effective realtime feedback. By time blood glucose drops in an event it’s too late to refuel. Where they are effective is in post event analysis, in which readings are compared with other data, heart rate, power, pace, breathing rate etc. As you rightly say, in normal every day use they provide very useful real time feedback on the impact of foods. They can also be useful to confirm the positive impacts of post meal exercise, intake of dietary fiber and mixing proteins/fats with carbs. However, the positive impact of all those things are well established, CGM might serve to drive the message home.
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